The Redmi brand launched the Redmi K50 Pro and Redmi K50 models based on the Tianji 9000 and Tianji 8100 platforms at the press conference some time ago, and both models seem to have received a good market response.
However, behind these two machines, there is also a K40 universe finale - Redmi K40S, priced at 1799 yuan.
Compared with last year's K40 series, this year's K40S uses a new set of design IDs, a set of designs similar to this year's Redmi brand flagship K50 series, the camera module is a two-stage design, the difference is that the K40S bezel is changed to a straight-sided design.
On the front of the Redmi K40S, is a 6.67-inch OLED straight board screen, from the Samsung display, using E4 material, supporting the highest refresh rate of 120Hz, with a touch sampling rate of up to 360Hz, and a front camera is placed in the top center of the digging hole.
The actual performance looks at WHYLAB, our laboratory measured the manual maximum brightness of this screen 487.71nits, and the external strong light can even reach the global brightness of 883.83nits under the stimulation of the outside world, which has been brighter than many flagships, and the brighter screen helps the display of HDR content. This screen supports an 8-bit color depth display, and although it doesn't have 1 billion colors, its color reproduction performance is good - look at the results measured in our laboratory.
First of all, Xiaomi gave the Redmi K40S three preset color modes, namely vivid, vivid and primary colors, and the laboratory measured 94.77% of the P3 color standard, 107.38% of the NTSC color standard, and 99.76% of the sRGB color standard coverage; in addition, in the advanced options, there are various custom adjustments under the P3 and sRGB color gamut standards, including RGB and HSV space colors, as well as the customization of contrast and gamma values, which will not be repeated in this regard , here only look at the preset color modes.
Going back to these three color modes and looking at their color accuracy performance, we still look at the 124 color "ΔE2000" value that reflects the color offset, and the lower the value, the lower the proof that the color offset, the better the color accuracy performance. Among them, the color shift of P3 color gamut measured in vivid mode is 4.01, the NTSC in vivid mode is 6.25, and the sRGB in primary color mode is 1.1 - the style of these modes is still relatively distinct, the color accuracy in primary color mode is quite high, and the vivid mode highlights a pleasing feeling, while the vivid mode can basically meet the display of most daily content.
After looking at the outside, and then looking inside - Xiaomi still equipped the Redmi K40S with the Snapdragon 870 platform, which is Qualcomm's best performance and power balance in recent years.
Last year's Redmi K40 optimized this combination to a very good state, how is this year's Redmi K40S performing? Look directly at the gaming performance of the Redmi K40S. Continuing the three games of "Glory of Kings", "Peace Elite" and "Original God", this time there are no longer multiple frame rate modes for testing, single-handed, all three games run on the highest frames available. First look at the 120fps of "Glory of the King", measured its average frame rate of 117.69fps, the frame rate has been maintained above 100fps, but the fever has also followed, the maximum temperature on the back is 44.6 °C.
Looking at "Peace Elite", the frame rate change line can see that the performance of the future is still very stable, and the line is also up to the back frame rate change amplitude - the overall average frame rate is 81.62fps, and 29 frame rate jitters are recorded, of which 10 times more serious jitter appears, and the temperature of the back is also 45.1 °C.
Finally, looking at the performance of the famous running game "Original God", the game screen is set to 60fps mode, and its average frame rate is 45.63fps, a total of 16 more serious frame rate shakes were recorded, and the back temperature is 45.5 °C.
In this way, it seems that Xiaomi still has reservations in the Redmi K40S, and there is still some room for progress, in fact, it can give the Redmi K40S Snapdragon 780 platform better tuning.
Camera, K40S is still a three-camera configuration, its main camera is still using the Sony IMX582 1/2-inch optical sensor, but the addition of OIS optical image stabilization, ultra-wide angle is still 119 ° 8 million pixel camera, as for the K40's telephoto macro end, to K40S changed to a 2 million pixel ordinary macro camera.
We focused our attention on this main camera, starting directly from the sample, to take a brief look at the K40S's image performance.
In general, the camera performance of the Redmi K40S can basically meet the expectations of this price point, the resolution and other aspects basically meet the daily life, the color is slightly saturated, and its tolerance is still slightly weaker, so in the environment of a larger light ratio, the details at the junction of light and dark are not so good. Look at the performance of night and indoor samples.
Its imaging style is basically close to that of the day, and the look and feel is still good in a more uniform environment, but if you look closely, you can feel that the details are somewhat fleshy, and the large light than the detail defects will be magnified to a certain extent, and the noise control at the large color block is not enough.
K40S uses a 4500mAh capacity battery, with a 67W fast charge, more conscientious than last year's Redmi K40 33W, how much faster can it actually be?
Our WHYLAB lab measured it in a standard environment in a full charge of 43 minutes, 10 minutes faster than the K40. Breaking it open, The Redmi K40S can start 5 minutes to 20%, 15 minutes can be more than half, reaching 54%, and the highest temperature of the entire charging process does not exceed 40 ° C, with the positioning of K40S to see the performance is still quite good. The 4500mAh capacity battery does not seem to be much or too little today, it can only be regarded as decent, and under the role of MIUI and Snapdragon 870 platform, how is its endurance performance?
Continue to sacrifice our WHYLAB laboratory standard five-hour endurance test, in a unified environment, unified including watching online long video (B station), short video, e-book, brush Weibo, shooting, playing games, chat WeChat, online shopping, call and listen to online music, a total of 10 items, each lasting half an hour, a total of 5 hours, to compress the simulation of our daily use of the power loss, and finally Redmi K40S remaining 47% of the power, to tell the truth this score is still slightly worse, with last year K40 has a big gap, I hope that the subsequent system update can optimize its power consumption.
In the five-hour endurance test, we also monitored the fuselage temperature of each project of Redmi K40S, and recorded the most serious project of the whole process as "game", the front recorded the highest 40.1 °C, and the back 39.6 °C, sure enough, it was Snapdragon 870 "God U", with 3112 square millimeters of liquid cooling structure, the temperature control of the whole machine is quite good.
Finally, look at the standby of The Redmi K40S, turn off the screen at night when fully charged, turn on the mobile network, keep the basic app running in the background for 8 hours, to simulate the power consumption of the Redmi K40S night sleep screen, to spy on its standby performance - a test run down, the machine finally left 98% of the power, the performance is basically in line with expectations. In general, the redmi K40S's charging and cooling control are doing well, and the battery life still has room for improvement and opportunities for improvement. As the final work of the Redmi K40 series, K40S does not actually mean to replace K40 at this stage, but borrows the shell of K40 to further explore the audience of the Redmi K series - the price starting from 1799 yuan is more tempting than the K40 starting from 1999 yuan; the hardware is basically consistent with the previous generation of products, and the charging, main camera and even increased, and now the problem is that Xiaomi's optimization in details is not in place, and there is still room for progress in the later stage. It is also expected that Xiaomi can see further optimizations in future system updates.
The humble Redmi K40S has the potential to become a hot model of Xiaomi Home offline this year.